Open this photo in gallery: Nazar Yuschenko of Lviv, 25, is a former graphic designer who co-founded an air reconnaissance group for his Ukrainian infantry batallion.Anton Skyba/The Globe and Mail The Ukraine war is the first mass-scale drone war, with tens of thousands of the deadly airborne robots deployed by each side. It wasn’t always that way. The Ukrainian brigade of Nazar Yuschenko learned that no drones meant fighting weakness. He and three of his fellow machine-gunners, all of them tech-savvy young men, began experimenting with drones – also known as UAVs, unmanned aerial vehicles – more than a year...